Safety-plug.



A. G. SANGER.

SAFETY PLUG.

APPLICATION FILED MAY13,1913.

Patented Mar. 10, 1914.

ALBERT C. SANGER, 0F BRUNSWICK, MARYLAND.

SAFETY-PLUG.

Specification of Letters Patent.

Application filed May 13, 1913.

Serial No. 767,427.

To all whom it may concern:

Be it known that I, ALBERT C. SANGER, a citizen of the United Stateg'rcsiding at Brunswick, in the county of Frederick and State of Maryland, have invented certain new and useful Improvements in Safety- Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to new and useful improvements in safety plugs and more particularly to that class used in connection with steam boilers and my object is to pr vide a plug adapted to be introduced through the crown sheet of the boiler, said plug having a central, vertical bore therethrough and laterally extending bores communicating with the central bore, said bores being nor mally filled with fusible substance.

A further object is to provide a plate to receive said plug, said plate having a hollow extension thereon, the opening in the extension, terminating at its lower end in a passage, which passage is in the path of the lateral bores in the plug. And a further object is to provide means for conveying water to the tubular extension froma point below the plug,

Other objects and advantages will be hereinafter set forth and pointed out in the aceompanyiug specification.

In the accom anying drawings which are made a part 0' this application, Figure l, is a sectional view through a portion of a boiler showing my improved device attached thereto. Fig. 2, is an enlarged detail sectional view through the crown sheet of a boiler and the safety plug. Fig. 3, is a top plan view thereof.

Referring to the drawings in which similar reference numerals designate similar parts throughout the drawings, 1 indicates the crown sheet of a boiler, said crown sheet. forming a part of the wall of a fire box 2. said fire box being constructed in the usual or any preferred manner.

Formed in the apex of the crown sheet is an opening 3 to form a passage for the safety plug 4, said plug being secured to a plate 5, 'irovided for that purpose. The plate 5 is attached to the crown sheet in any preferred manner, preferably by means of rivets (3 and in such manner as to prevent leakage, the central portion of the plate having a threaded opening 7 extending vertically thcrethrough to receive the threaded portion 8 of the plug 1, the lower end of the plug having a flange 9 thereon to limit the upward movement of the plug. Extending vertically through the center of the plug 4 IS a bore 10, into which is placed any suitable form of fusible material 11, the upper and lower ends of the bore 10 being preferably flared, as shown at 12, to better hold the fusible material from being blown from the plug by the pressure of the steam in the boiler. Extending laterally from the bore 10 to the outer edge of the plug, and preferably inclined upwardly from their inner to their outer ends, are auxiliary bores 13, which are also arranged to receive the fusible material, the outer end of one or the other of said auxiliary bores being posi-v tioned in registration with a passage 14L formed in the plate 5, the opposite end of the pass-ago connnunicating with the'opcning 15 in a tubular extension 16, which projects beyond the face of the plate. Attached to the extension 16 is a pipe 17, the free end of which extended downwardly between the tire box lining and the outer wall of the boiler to a point a distance below the plug 4, so that when the fusible material leaves the plug, the pressure of the steam on the water remaining in the boiler will force the water upwardly through the pipe, through the extension and passage communicating therewith, through the auxiliary bore communicating therewith and through the bore in the plug. The end of the pipe engaging the extension is attached in such manner as to make the same steam tight and to prevent any possibility of the same becoming loosened. a rivet or the like 18 is passed transversely through the pipe and extension, while the lower end of the pipe is attached to the wall of the boiler in any suitable lllllll lltil.

I am aware that plugs having fusible matcrial therein have been used in connection with boilers, but as the water is necessarily below the upper cud of the plug before the fusible material becomes fused, nothing but the steam in the boiler is directed into the fire box and the fire is not extinguished, so that if a strong tire is burning, suilicicnt steam may be formed to explode the boiler before a snlliciont amount of steam can escape to reduce the pressure.

It is the prime object of this device there- Patented Mar. 10,1914.-

fore, to provide means for causing water to I descend into the fire, box and immediately quench the fire or so reduce the heating qualities thereof as to prevent the same from increasing the steam pressure in the boiler. lhis is accomplished by providing the auxiliary bores in the plug and positioning one of them in alinement with the passage through the plate and pipe and as the open end of the pipe is positioned a distance below the crown sheet of the boiler, the pressure of the steam on the Water will force the water up through the pipe and into the fire box, while the steam passing through the main bore of the plug will act to siphon the water through the pipe,

This device can be very cheaply constructed and readily attached and can be applied to any make of boiler and in YlGW of the fact that steam passes through the plug with the water, the water will strike the fuel with sufiicient force to cause the water to splash 1. The combination with a boiler, of a safety plughaving a central bore and diametrically opposed laterally extending bores ostages communicating at. their inner ends with the central bore and means to convey water into .one or the other of the lateral. bores from. a

point below the plug.'

2; The combination with a boiler, of a safety plug having bores extending longitudinally and laterally therethrough, a plate to receive said plug, said plate having openings communicating with the laterally extending bores and means to convey water through said openings and bores.

3. The combination With a boiler, of a safety plug having bores extending longitudinally and transversely therethrough, a plate to receive said plug, said plate having a tubular extension and a passage communieating with the lateral bores at one end and the hollow of the extensionat its opposite end, and a pipe extending from the exten- SIOII to a point below the plug.

In testirnony whereof I have signed my name to this specification in the presence of K two subscribing witnesses. ALBERT c. SANGER.

Witnesses:

E. R. HOGAN, JACOB ll. FRY. 

